Google Maps PanTo OnClick

The issue is that your using map.panTo(latitude,longitude) but the google maps API uses this: panTo(latLng myLatLng) where latLng is a google map class.

try something like this (untested)

function clickroute(lati,long) {
      var latLng = new google.maps.LatLng(lati, long); //Makes a latlng
      map.panTo(latLng); //Make map global
  }

Look here for more info.

EDIT As someone else stated you don't want to remake a new map. Maybe its easier to make it global?

The panTo accepts LatLng object as parameters not just coordinates. Create a LatLng object before passing it to panTo method.

function clickroute(lati,long) {
    map.panTo(new google.maps.LatLng(lati,long));
    return false; //this will cancel your navigation
}

Your page reloads because you do not cancel the navigation event in onClick that you put in the anchor tag. See comment in code above.

And like the others say take out the map variable from this function and make map global.